Reference library7 entries

Category: Chemistry

Significant figure rules for chemical calculations, including stoichiometry, pH and logs, and molar mass.

AP Chem vs IB Physics: Which Sig Fig Convention Should You Use?

AP Chemistry emphasizes significant-figure arithmetic with textbook half-up rounding, while IB Physics prioritizes measurement uncertainty and decimal-place alignment. Use your course convention for exams…

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Common Sig Fig Mistakes That Cost You Marks in Chemistry Exams

A detailed reference to the significant-figure errors that most often cost marks in chemistry exams, with rules, worked examples, counter-examples, standards citations, and exam-safe…

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Significant Figures in Molarity and Dilution Calculations: Precision and Rounding

In molarity and dilution calculations, report the result with the least number of significant figures among multiplication/division inputs; for added volumes, first apply the…

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Percent Error in Chemistry: AP, IB, and High School Grading Conventions

Percent error in chemistry is |experimental − accepted| ÷ |accepted| × 100%, but AP, IB, and high-school grading differ on sign, sig figs, and…

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Significant Figures in Chemistry: Stoichiometry, pH, and Molar Mass

Master significant figures in chemistry with a focus on stoichiometry, pH calculations, and molar mass. Learn rules, standards, and common pitfalls.

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Molar Mass: How Many Sig Figs Should You Use?

Learn the rules for determining significant figures in molar mass calculations, including conventions, standards, and common pitfalls.

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pH and Sig Figs: Why Only the Decimals Count

In pH measurements, only the digits after the decimal point are significant. This article explains the logarithmic basis, the rules, and common pitfalls.

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